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In OTL :

Napoléon Louis married his first cousin, Charlotte, who was the daughter of Joseph Bonaparte, eldest brother of Napoléon I. He and his younger brother Louis-Napoléon Bonaparte settled in Italy, where they espoused liberal politics and became involved with the Carbonari, an organization fighting Austria's domination of northern Italy.

On 17 March 1831, while fleeing Italy due to a crackdown on revolutionary activity by Papal and Austrian troops, Napoléon Louis, suffering from measles, died in the arms of his brother in Forlì.Eventually, the Napoleonic Empire was restored by Napoléon Louis's younger brother, who became Napoléon III in 1852.

In TTL : (Charles) Louis-Napoléon Bonaparte (OTL Napoléon III) dies and his brother Napoléon Louis Bonaparte survives.
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